{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-64846",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-07-20T18:31:39.290Z",
        "datePublished": "2026-08-20T16:18:06.729Z",
        "dateUpdated": "2026-08-20T19:32:22.878Z"
    },
    "containers": {
        "cna": {
            "title": "Nix: Arbitrary file truncation outside the sandbox with recursive-nix experimental feature",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-61",
                            "lang": "en",
                            "description": "CWE-61: UNIX Symbolic Link (Symlink) Following",
                            "type": "CWE"
                        }
                    ]
                },
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-367",
                            "lang": "en",
                            "description": "CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "attackComplexity": "HIGH",
                        "attackVector": "LOCAL",
                        "availabilityImpact": "NONE",
                        "baseScore": 2.8,
                        "baseSeverity": "LOW",
                        "confidentialityImpact": "NONE",
                        "integrityImpact": "LOW",
                        "privilegesRequired": "LOW",
                        "scope": "CHANGED",
                        "userInteraction": "NONE",
                        "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:N",
                        "version": "3.1"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/NixOS/nix/security/advisories/GHSA-6h4g-g5j9-fm5f",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/NixOS/nix/security/advisories/GHSA-6h4g-g5j9-fm5f"
                },
                {
                    "name": "https://github.com/NixOS/nix/pull/15401",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/NixOS/nix/pull/15401"
                },
                {
                    "name": "https://github.com/NixOS/nix/commit/26679828f74ee6e82a4100904e6361f993ff5390",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/NixOS/nix/commit/26679828f74ee6e82a4100904e6361f993ff5390"
                }
            ],
            "affected": [
                {
                    "vendor": "NixOS",
                    "product": "nix",
                    "versions": [
                        {
                            "version": "< 2.35.0",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-08-20T16:18:06.729Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Nix is a package manager for Linux and other Unix systems. Prior to 2.35.0, a malicious derivation executed with the recursive-nix experimental feature can exploit a time-of-check/time-of-use race involving final symlink handling in the LocalStore restore path. The race can cause writeFile to follow a substituted final symlink when opening a path with O_TRUNC instead of enforcing FinalSymlink::DontFollow, allowing the Nix process or nix-daemon to create or truncate an empty file outside the build sandbox with the daemon user's permissions. The primitive does not provide arbitrary-content writes and requires winning the race. This issue is fixed in version 2.35.0."
                }
            ],
            "source": {
                "advisory": "GHSA-6h4g-g5j9-fm5f",
                "discovery": "UNKNOWN"
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-08-20T19:32:14.918442Z",
                                "id": "CVE-2026-64846",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "no"
                                    },
                                    {
                                        "Technical Impact": "partial"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-08-20T19:32:22.878Z"
                }
            }
        ]
    }
}